prevent bad behavior when no unworn items

app/models/outfit.rb

@@ -51,6 +51,7 @@ class Outfit < ActiveRecord::Base
     new_rels = []
     all_item_ids.each do |key, item_ids|
       worn = key == 'worn'
+      unless item_ids.blank?
         item_ids.each do |item_id|
           rel = ItemOutfitRelationship.new
           rel.item_id = item_id
@@ -58,6 +59,7 @@ class Outfit < ActiveRecord::Base
           new_rels << rel
         end
       end
+    end
     self.item_outfit_relationships = new_rels
   end